Question 153190
I'll do the first two to get you started


The slope of any line in the form of y=k where k is any number is 0 since the equation is a horizontal line. So the slope of {{{y=8}}} is 0


So the graph of {{{y=8}}} is:


{{{ drawing(500, 500, -10, 10, -10, 10,
 graph( 500, 500, -10, 10, -10, 10,8)

)}}} Graph of {{{y=8}}}



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The slope of any line in the form of x=k where k is any number is undefined since the equation is a vertical line. So the slope of {{{x=9}}} is undefined.


So the graph of {{{x=9}}} is:


{{{ drawing(500, 500, -10, 10, -10, 10,
 line(9,-20,9,20),
 graph( 500, 500, -10, 10, -10, 10,0)

)}}} Graph of {{{x=9}}}